diff options
| -rw-r--r-- | src/compiler/blob.c | 16 | ||||
| -rw-r--r-- | src/compiler/blob.h | 22 |
2 files changed, 37 insertions, 1 deletions
diff --git a/src/compiler/blob.c b/src/compiler/blob.c index 2e20a11dc0c..a78fcd41a76 100644 --- a/src/compiler/blob.c +++ b/src/compiler/blob.c @@ -52,6 +52,11 @@ grow_to_fit(struct blob *blob, size_t additional) if (blob->size + additional <= blob->allocated) return true; + if (blob->fixed_allocation) { + blob->out_of_memory = true; + return false; + } + if (blob->allocated == 0) to_allocate = BLOB_INITIAL_SIZE; else @@ -105,6 +110,17 @@ blob_init(struct blob *blob) blob->data = NULL; blob->allocated = 0; blob->size = 0; + blob->fixed_allocation = false; + blob->out_of_memory = false; +} + +void +blob_init_fixed(struct blob *blob, void *data, size_t size) +{ + blob->data = data; + blob->allocated = size; + blob->size = 0; + blob->fixed_allocation = true; blob->out_of_memory = false; } diff --git a/src/compiler/blob.h b/src/compiler/blob.h index 8a7a28b4f3c..e23e392eedd 100644 --- a/src/compiler/blob.h +++ b/src/compiler/blob.h @@ -56,6 +56,12 @@ struct blob { /** The number of bytes that have actual data written to them. */ size_t size; + /** True if \c data a fixed allocation that we cannot resize + * + * \see blob_init_fixed + */ + bool fixed_allocation; + /** * True if we've ever failed to realloc or if we go pas the end of a fixed * allocation blob. @@ -85,12 +91,26 @@ void blob_init(struct blob *blob); /** + * Init a new, fixed-size blob. + * + * A fixed-size blob has a fixed block of data that will not be freed on + * blob_finish and will never be grown. If we hit the end, we simply start + * returning false from the write functions. + */ +void +blob_init_fixed(struct blob *blob, void *data, size_t size); + +/** * Finish a blob and free its memory. + * + * If \blob was initialized with blob_init_fixed, the data pointer is + * considered to be owned by the user and will not be freed. */ static inline void blob_finish(struct blob *blob) { - free(blob->data); + if (!blob->fixed_allocation) + free(blob->data); } /** |